EP0072424A1 - Procédé de fabrication d'articles frittés de grande précision - Google Patents
Procédé de fabrication d'articles frittés de grande précision Download PDFInfo
- Publication number
- EP0072424A1 EP0072424A1 EP82106069A EP82106069A EP0072424A1 EP 0072424 A1 EP0072424 A1 EP 0072424A1 EP 82106069 A EP82106069 A EP 82106069A EP 82106069 A EP82106069 A EP 82106069A EP 0072424 A1 EP0072424 A1 EP 0072424A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- core
- sintered
- thermal expansion
- nitride
- boron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 11
- 239000011162 core material Substances 0.000 claims description 44
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims description 8
- 229910052580 B4C Inorganic materials 0.000 claims description 6
- 229910052582 BN Inorganic materials 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 4
- 238000000462 isostatic pressing Methods 0.000 claims description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 4
- 239000000395 magnesium oxide Substances 0.000 claims description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 229910045601 alloy Inorganic materials 0.000 claims description 2
- 239000000956 alloy Substances 0.000 claims description 2
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 2
- 238000007654 immersion Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 229910001069 Ti alloy Inorganic materials 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- PIGFYZPCRLYGLF-UHFFFAOYSA-N Aluminum nitride Chemical compound [Al]#N PIGFYZPCRLYGLF-UHFFFAOYSA-N 0.000 description 1
- FUWMBNHWYXZLJA-UHFFFAOYSA-N [Si+4].[O-2].[Ti+4].[O-2].[O-2].[O-2] Chemical compound [Si+4].[O-2].[Ti+4].[O-2].[O-2].[O-2] FUWMBNHWYXZLJA-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 210000002023 somite Anatomy 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
- B22F2005/103—Cavity made by removal of insert
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2203/00—Controlling
- B22F2203/05—Controlling thermal expansion
Definitions
- the invention relates to a method for producing sintered parts with great dimensional accuracy.
- Sintered parts that contain bores or other cavities accordingly have an inner contour, such as.
- B. pipes, containers or internally cooled blades of turbomachinery are manufactured using cores that are spaced within a mold. Sinterable powder, mixed with a plasticizer, is brought into the space between the mold and the core by injection molding, cold pressing, isostatic pressing or slip casting.
- the shape resembles the outside shape of the body to be manufactured taking into account the shrinkage dimension, while the core has the inside shape of the body to be manufactured on the outside.
- the core consists of a rod and the form of a rubber tube with a correspondingly larger inner diameter. After the one fill the molding compound in the rubber tube, the upper end is closed; the entire assembly is then subjected to a pressure of 500 to 6000 bar in an isostatic press. This causes the rubber hose to press the molding compound against the rod, creating a blank with the desired tube shape.
- the inside of the tube produced corresponds exactly to the rod-shaped core and therefore generally does not need to be reworked, while the outside of the tube produced usually has to be reworked due to the inaccurate shape of the hose.
- the resulting blank is sintered in the usual way in the prior art after removal of the core.
- the object of the invention is to provide a method for producing sintered parts with precise dimensions, so that reworking is no longer necessary if possible.
- the core runs with the mass to be sintered through the whole sintering process, so it is only removed after sintering; it does not suffer any strange plastic deformation during sintering.
- the sintered mass lies precisely on the core. No significant dimensional deviations due to the Er described at the beginning can occur on the internal dimensions appearances occur.
- the dimensional accuracy of the outer dimensions is also considerably improved compared to the known method, and the more so, the smaller the wall thickness compared to the core diameter.
- the thermal expansion of the core is less than or equal to the thermal expansion of the sintered part, it sits in the manner of a shrink fit on the core. This can then by chemical reactions, such as. B. Burning or dissolving in a solvent, in acids or bases.
- the core can be composed of individual parts q in such a way that, despite the shrinkage stress, they are in succession can be removed, possibly with destruction of a first core part.
- the core and the sintered part must not react substantially chemically with one another; the core material is selected according to claim 2 accordingly.
- the core remaining in the mold during the sintering process can be introduced into the mold in various ways, namely as an insert core in the injection molding or slip casting production process or also by the sintering powder being pressed around it during the isostatic pressing process (claims 4 and 5).
- Cores with undercuts can also be used; the individual parts are then manufactured separately and then put together; a corresponding intermediate gap can be provided be controlled, whereby a greater thermal expansion of the core compared to the sintered part is controlled.
- a powdery separating layer made of material compatible with the sintered material can be sprayed onto it or applied by immersion in a powder-containing liquid;
- the tested release agents such as graphite, boron nitride, boron carbide, aluminum oxide, magnesium oxide or titanium oxide are selected with a view to their mutual chemical compatibility.
- Combustion chambers and their inlet cones made of SiC and Si 3 N 4 ′, heat exchanger elements made of SiC and Si 3 N 4 and other hollow parts of all kinds, such as pipes or containers, which are exposed to high temperatures, are preferably produced by the process according to the invention.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Ceramic Products (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3132141 | 1981-08-14 | ||
| DE3132141A DE3132141C1 (de) | 1981-08-14 | 1981-08-14 | Verfahren zum Herstellen von Sinterteilen grosser Gennauigkeit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0072424A1 true EP0072424A1 (fr) | 1983-02-23 |
Family
ID=6139301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82106069A Withdrawn EP0072424A1 (fr) | 1981-08-14 | 1982-07-07 | Procédé de fabrication d'articles frittés de grande précision |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0072424A1 (fr) |
| DE (1) | DE3132141C1 (fr) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0194504A2 (fr) * | 1985-02-26 | 1986-09-17 | Kabushiki Kaisha Toshiba | Corps composite et son procédé de fabrication |
| WO1987005241A1 (fr) * | 1986-03-04 | 1987-09-11 | Asea Stal Ab | Procede de fabrication de produits metalliques a partir d'une poudre par compression isostatique a chaud en utilisant des noyaux de ceramique |
| EP0408531A1 (fr) * | 1989-06-01 | 1991-01-16 | Abb Stal Ab | Procédé de fabrication d'un anneau circulaire fendu |
| FR2666038A1 (fr) * | 1990-08-22 | 1992-02-28 | Sochata Energy 1 Soc | Moule de fabrication de pieces metalliques creuses. |
| EP0963267A1 (fr) * | 1996-04-15 | 1999-12-15 | Dynamet Holdings Inc. | Filieres et moules a formes nettes et procede de fabrication associe |
| DE102007003102A1 (de) * | 2007-01-16 | 2008-07-17 | Franz Kessler Gmbh | Spannzangen-Herstellungsverfahren |
| DE102009036902A1 (de) * | 2009-08-11 | 2011-02-24 | Gkn Sinter Metals Holding Gmbh | Verfahren zur Herstellung eines Sinterbauteils |
| EP2610022A1 (fr) * | 2011-12-29 | 2013-07-03 | Höganäs Aktiebolag (PUBL) | Redimensionnement de frittage des aciers frittés |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1483695A1 (de) * | 1965-08-11 | 1969-02-20 | Hoechst Ag | Verfahren zum Herstellen masshaltiger und lagerrichtiger Hohlraeume in harten Sinterkoerpern |
| FR2187473A1 (fr) * | 1972-06-15 | 1974-01-18 | Crucible Inc | |
| US3992202A (en) * | 1974-10-11 | 1976-11-16 | Crucible Inc. | Method for producing aperture-containing powder-metallurgy article |
| DE2742816A1 (de) * | 1977-09-23 | 1979-03-29 | Motoren Turbinen Union | Bauteile aus si-keramik mit hohlraum und verfahren zur herstellung solcher bauteile |
-
1981
- 1981-08-14 DE DE3132141A patent/DE3132141C1/de not_active Expired
-
1982
- 1982-07-07 EP EP82106069A patent/EP0072424A1/fr not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1483695A1 (de) * | 1965-08-11 | 1969-02-20 | Hoechst Ag | Verfahren zum Herstellen masshaltiger und lagerrichtiger Hohlraeume in harten Sinterkoerpern |
| FR2187473A1 (fr) * | 1972-06-15 | 1974-01-18 | Crucible Inc | |
| US3992202A (en) * | 1974-10-11 | 1976-11-16 | Crucible Inc. | Method for producing aperture-containing powder-metallurgy article |
| DE2742816A1 (de) * | 1977-09-23 | 1979-03-29 | Motoren Turbinen Union | Bauteile aus si-keramik mit hohlraum und verfahren zur herstellung solcher bauteile |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0194504A2 (fr) * | 1985-02-26 | 1986-09-17 | Kabushiki Kaisha Toshiba | Corps composite et son procédé de fabrication |
| EP0194504A3 (en) * | 1985-02-26 | 1987-02-04 | Kabushiki Kaisha Toshiba | Composite body and method of manufacturing the same |
| US4857411A (en) * | 1985-02-26 | 1989-08-15 | Kabushiki Kaisha Toshiba | Composite body and method of manufacturing the same |
| WO1987005241A1 (fr) * | 1986-03-04 | 1987-09-11 | Asea Stal Ab | Procede de fabrication de produits metalliques a partir d'une poudre par compression isostatique a chaud en utilisant des noyaux de ceramique |
| US4855103A (en) * | 1986-03-04 | 1989-08-08 | Asea Stal Ab | Method for manufacturing metallic products from powder by hot isostatic pressing using ceramic cores |
| US5082623A (en) * | 1989-06-01 | 1992-01-21 | Abb Stal Ab | Method of manufacturing a split circular ring |
| EP0408531A1 (fr) * | 1989-06-01 | 1991-01-16 | Abb Stal Ab | Procédé de fabrication d'un anneau circulaire fendu |
| FR2666038A1 (fr) * | 1990-08-22 | 1992-02-28 | Sochata Energy 1 Soc | Moule de fabrication de pieces metalliques creuses. |
| EP0963267A1 (fr) * | 1996-04-15 | 1999-12-15 | Dynamet Holdings Inc. | Filieres et moules a formes nettes et procede de fabrication associe |
| EP0963267A4 (fr) * | 1996-04-15 | 2004-04-14 | Dynamet Holdings Inc | Filieres et moules a formes nettes et procede de fabrication associe |
| DE102007003102A1 (de) * | 2007-01-16 | 2008-07-17 | Franz Kessler Gmbh | Spannzangen-Herstellungsverfahren |
| DE102009036902A1 (de) * | 2009-08-11 | 2011-02-24 | Gkn Sinter Metals Holding Gmbh | Verfahren zur Herstellung eines Sinterbauteils |
| EP2610022A1 (fr) * | 2011-12-29 | 2013-07-03 | Höganäs Aktiebolag (PUBL) | Redimensionnement de frittage des aciers frittés |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3132141C1 (de) | 1982-12-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Designated state(s): FR GB IT NL SE |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19840208 |
|
| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: HUETHER, WERNER, DR.-ING. Inventor name: ANDREES, GERHARD |